Bliss is of Consciousness (Atman or Self), but it is experienced by a pure mind
He who does not control his mind, he is controlled by his mind and suffers.
A sincere, diligent, long time practice is need in order to conquer our mind.
In this work it is included the purification of the mind from the Tamas and Rajas gunas as well as from its programming and its passions (lust, gluttony, greed, pride, fear, anger, jealousy, laziness, etc.).
Once the mind is purified and is full of sattva, even without to make an effort to feel happy, we live in peace, completeness and bliss!